CN108135408A - Toilet paper - Google Patents

Abstract

A1-ply toilet paper comprises 15-55% by mass of softwood kraft pulp and the constituent fibers of the hardwood kraft pulp and the softwood kraft pulp, and has a gram amount per square meter of 21.0-22.5 g/m²The paper has a paper thickness of 110 to 155 [ mu ] m, contains 0.024 to 0.075 mass% of a fatty acid ester compound based on the mass of pulp, contains 0.015 to 0.075 mass% of a fatty acid amide compound based on the mass of pulp, has an elongation of 14 to 25%, an MMD of less than 9.3, a dry tensile strength in the machine direction of 245 to 330cN/25mm, and a dry tensile strength in the transverse direction of 85 to 135cN/25 mm.

Description

toilet paper

technical field

The present invention relates to toilet paper and a method for its manufacture.

Background technique

Toilet paper is required to have excellent skin feel such as softness and smoothness, and strength that does not break when the skin is wiped.

By using virgin pulp as the raw material of pulp, and adding a softener inside to improve the hand feeling, the goodness of skin touch can be improved.

However, the internal softener also has the effect of reducing the strength of the paper, and it is difficult to embody the excellent touch of the skin and the strength of the paper at the same time only with the internal softener.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 4875488

Contents of the invention

Therefore, the main object of the present invention is to provide a toilet paper that has not only softness but also excellent skin feel such as smoothness and strength that is hard to break when wiping.

According to one mode, a kind of toilet paper is provided,

It is characterized in that the above-mentioned toilet paper is toilet paper of one layer,

The constituent fibers are broad-leaved tree kraft pulp and coniferous tree kraft pulp, including 15 to 55% by mass of the above-mentioned coniferous tree kraft pulp,

The gram weight per square meter is 21.0～22.5g/m ² ,

Paper thickness is 110～155μm,

Containing 0.024 to 0.075% by mass of a fatty acid ester compound relative to the pulp mass,

Containing 0.015 to 0.075% by mass of fatty acid amide compounds relative to pulp mass,

The elongation is 14-25%,

MMD less than 9.3,

The dry tensile strength in the longitudinal direction is 245-330cN/25mm, and the dry tensile strength in the transverse direction is 85-135cN/25mm.

According to other aspects, there is provided a toilet paper,

It is characterized in that the above-mentioned toilet paper is a two-ply toilet paper,

The constituent fibers are broad-leaved tree kraft pulp and coniferous tree kraft pulp, including 15 to 55% by mass of the above-mentioned coniferous tree kraft pulp,

Grams per square meter per layer is 15.8-17.5g/m ² ,

Paper thickness is 110～155μm,

Containing 0.024 to 0.075% by mass of a fatty acid ester compound relative to the pulp mass,

Containing 0.015 to 0.075% by mass of fatty acid amide compounds relative to pulp mass,

The elongation per layer is 13.0-22%,

MMD less than 9.3,

The dry tensile strength in the longitudinal direction of one layer is 130 to 175 cN/25mm, and the dry tensile strength in the transverse direction is 45 to 75 cN/25mm.

According to another aspect, there is provided a method of manufacturing toilet paper, characterized in that,

Using hardwood kraft pulp and coniferous kraft pulp as fiber raw materials, 0.08 to 0.15% by mass of pulp with a particle size of 0.1 μm or less is sequentially added to a papermaking raw material containing 15 to 55% by mass of the above-mentioned coniferous kraft pulp. Fatty acid ester compound and fatty acid amide compound having a particle size of 0.5 to 5 μm in an amount of 0.05 to 0.15% by mass relative to the pulp mass is prepared from a papermaking raw material in which the fatty acid ester compound and fatty acid amide compound are added.

According to the present invention as described above, there is provided a toilet paper having excellent skin feel such as smoothness in addition to softness, and strength that is hard to break when wiping.

Description of drawings

FIG. 1 is a diagram for explaining the measurement method of MMD according to the present embodiment.

Detailed ways

Embodiments of the present invention will be described below. The toilet paper according to the present embodiment is intended to be a one-ply toilet paper also called a single ply or a two-ply toilet paper also called a two-ply.

Constituent fibers of the toilet paper according to the present embodiment are softwood kraft pulp (NBKP) and broadleaf kraft pulp (LBKP). Then, in particular, 15 to 55% by mass of coniferous kraft pulp is contained. Generally speaking, with respect to pulp fibers, as the blending ratio of hardwood kraft pulp increases, the paper strength decreases and softness increases, and when the blending ratio of softwood kraft pulp increases, the paper strength increases and softness decreases. In this embodiment, in particular, by setting the blending ratio of conifer kraft pulp to 15% by mass or more, sufficient paper strength can be exhibited, and by setting it to 55% by mass or less, softness can be improved.

In this embodiment, in the case of one ply (single ply), the grams per square meter of toilet paper can be 21.0 to 22.5 g/m ² . In the toilet paper of one ply, by setting the gram per square meter to 21.0 g/ or more, it is easy to ensure the strength required for wiping. In addition, softness can be improved by setting the gram per square meter to 22.5 g/m ² or less.

In addition, in the case of two layers (two layers), the grammage per square meter of each layer constituting the two layers can be 15.8 to 17.5 g/m ² . In the case of two layers, by setting the gram weight per square meter of each layer to 15.8 g/m ² or more, it is easy to secure the strength required for wiping. In addition, the softness can be improved by setting the gram per square meter per layer to 17.5 g/m ² or less.

In addition, the gram amount per square meter in this embodiment means the value measured based on JISP 8124 (1998).

The paper thickness of the toilet paper according to this embodiment can be set to 110 to 155 μm. This paper thickness is the paper thickness of 1 layer when it is made into 2 layers. By setting the paper thickness to 110 mm or more, it becomes easy to secure the strength required for wiping. Moreover, softness can be expressed by making paper thickness into 155 micrometers or less.

Paper thickness refers to the measurement of the test piece under the conditions of JIS P 8111 (1998) after fully conditioning the humidity using a dial-type thickness gauge (thickness measuring device) "PEACOCK G" (manufactured by Ozaki Seisakusho). get the value. The specific steps of this paper thickness measurement are to confirm that there is no dirt, dust, etc. between the plunger and the measuring table, lower the plunger onto the measuring table, move the scale of the above-mentioned dial-type thickness gauge to align with the zero point, and then, Raise the plunger to place the sample on the test bench, lower the plunger slowly, and read the measured value at this time. At this point, only the plunger is loaded. The terminal of the plunger was made of metal, and a circular plane with a diameter of 10 mm was brought into contact perpendicularly to the paper plane, and the load at the time of the paper thickness measurement was about 70 gf. The calculated average value was calculated by carrying out 10 measurements.

On the other hand, the toilet paper according to the present embodiment uses a specific softener compound in order to sufficiently improve the three requirements of softness, smoothness, and sufficient strength within the above-mentioned range of gram per square meter and paper thickness. The softening agent compound in the toilet paper according to the present embodiment is a fatty acid ester compound and a fatty acid amide compound. In particular, the content of the fatty acid ester compound is 0.024 to 0.075% by mass relative to the pulp mass. The fatty acid amide compound is set at 0.015 to 0.075% by mass.

Both fatty acid amide compounds and fatty acid ester compounds can improve softness. The fatty acid amide compound also has the effect of improving the smoothness of the surface. On the other hand, the fatty acid ester compound has the effect of improving the softness due to the fluffy and fluffy feeling.

In the sanitary paper according to this embodiment, if the content of the fatty acid amide compound is 0.015% by mass or more relative to the pulp mass, smoothness can be sufficiently expressed. Moreover, when content of a fatty acid ester type compound is 0.024 mass % or more with respect to pulp mass, smoothness and soft feeling can be provided. That is, smoothness and softness can be improved by making the fatty acid amide-based compound content 0.015% by mass or more and the fatty acid ester-based compound 0.024% by mass or more based on the pulp mass.

On the other hand, even if the fatty acid amide compound is contained so that the content of the fatty acid amide compound exceeds 0.075% by mass relative to the pulp mass, the smoothness does not improve so much. Moreover, if the fatty acid ester compound is 0.075 mass % or less with respect to pulp mass, sufficient intensity|strength can be expressed.

In this embodiment, the content of the fatty acid amide compound may be 0.015 mass % or more relative to the pulp mass, the fatty acid ester compound content may be 0.024 mass % or more relative to the pulp mass, and the fatty acid amide compound content may be relatively The pulp mass is 0.075 mass % or less, and the content of the fatty acid ester compound is 0.075 mass % or less with respect to the pulp mass. Thus, the use of fatty acid amide compounds and fatty acid ester compounds can effectively satisfy the three requirements of softness, smoothness, and sufficient strength. In this way, the toilet paper according to the present embodiment improves the smoothness, softness, and The strength required for wiping is increased.

Here, the above-mentioned fatty acid ester-based compound and fatty acid amide-based compound are internally added. In particular, as a method of internal addition, when papermaking a pulp slurry or a papermaking raw material mixed with an appropriate auxiliary agent, first add a fatty acid ester compound, and then add a fatty acid amide compound. More specifically, it is preferable to add a fatty acid ester compound to a mixing tank in the papermaking process, and to add a fatty acid amide compound to a feeding tank (seed tank) in the papermaking process.

In addition, in the other manufacturing process of the toilet paper which concerns on this embodiment, it can manufacture according to the normal method of the manufacturing method of general-purpose toilet paper.

It should be noted that the fixing rate of the fatty acid ester compound and the fatty acid amide compound in the pulp fiber is about 30 to 50%. Therefore, taking this fact into consideration during production, it is sufficient to use 0.08 to 0.15% by mass of the fatty acid ester compound based on the pulp mass, and use 0.05 to 0.15% by mass of the fatty acid amide compound based on the pulp mass.

The fatty acid ester compound enters the cavity (inner hole) of the fibrillated pulp fiber to prevent: after the papermaking is completed, that is, when the wet paper is dried to become dry paper, the above-mentioned cavity of the pulp fiber caused by hydrogen bonding is prevented. collapse. In addition, the fatty acid amide compound functions to coat the surface of pulp fibers to improve the smoothness of the surface.

Then, as described above, by providing a time difference between the mechanism of action based on fatty acid ester compounds and the mechanism of action based on fatty acid amide compounds, smoothness, softness, and strength required for wiping can be very effectively expressed.

In addition, in particular, it is particularly preferable to use a fatty acid ester compound having a particle size of 0.1 μm or less in the ratio of the softwood kraft pulp to the hardwood kraft pulp in the toilet paper according to the present embodiment. The particle size of the amide compound is a fatty acid amide compound having a particle diameter of 0.5 μm to 5 μm. Fatty acid ester compounds having a particle size of 0.1 μm or less tend to permeate into the cavities inside pulp fibers, and can more effectively exhibit the effects of the present embodiment. Moreover, the fatty acid amide compound of 0.5 micrometers - 5 micrometers shows the favorable coating action to the surface of the pulp fiber concerning this embodiment especially. If the particle diameter is larger than the above-mentioned particle diameter, the coating effect on the pulp fiber surface may become insufficient.

Here, the particle diameter in this embodiment refers to a median diameter, which is obtained by measuring the particle size distribution of latex obtained by emulsification by laser light scattering based on JIS Z 8825:2013.

The fatty acid ester compound according to the present embodiment may be either a cationic fatty acid ester compound or a nonionic fatty acid ester compound, and preferably contains both. In addition, the fatty acid ester compound is preferably a compound of an alcohol having 6 to 24 carbon atoms and a fatty acid having 7 to 25 carbon atoms. The alcohol may be any of linear alcohols, alcohols having branched chains, saturated alcohols, and unsaturated alcohols. Particularly preferred are alcohols having 10 to 22 carbon atoms, preferably lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol and oleyl alcohol. These may be used alone or in combination of two or more. In addition, the fatty acid having 7 to 25 carbon atoms may be any of straight-chain fatty acid, branched-chain fatty acid, saturated fatty acid, and unsaturated fatty acid. Particularly preferred are fatty acids having 10 to 22 carbon atoms, preferably lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid and oleic acid. These may be used alone or in combination of two or more.

On the other hand, the fatty acid amide compound can be obtained by reacting polyalkylenepolyamine and carboxylic acid. A preferred polyalkylene polyamine has at least 3 amino groups in the molecule, represented by the following formula (1).

H ₂ N－(R1－NH－)n－R1－NH ₂ ···(1)

(R1 is each independently an alkylene group having 1 to 4 carbon atoms, and n is an integer of 1 to 3)

In this polypropylene amine, different R1 may exist in a molecule|numerator. In addition, two or more kinds of polyalkylene polyamines can also be used. Preferably R1 is ethylene.

On the other hand, the above-mentioned carboxylic acid is preferably a carboxylic acid having 10 to 24 carbon atoms, and may be either a saturated carboxylic acid or an unsaturated carboxylic acid. In addition, any of linear carboxylic acid and branched carboxylic acid may be used. Among them, a carboxylic acid having 12 to 22 carbon atoms is preferable, and a carboxylic acid having 14 to 18 carbon atoms is particularly preferable.

On the other hand, the toilet paper according to the present embodiment has an elongation of 14 to 25% in the case of one layer. In addition, in the case of two layers, the elongation per layer is 13.0 to 22%. The elongation of toilet paper is greatly affected by the wrinkle structure, especially in combination with the above-mentioned grams per square meter, paper thickness and softener compound. The toilet paper with the above-mentioned elongation can feel the smoothness of the surface, and in turn, Also has the desired strength when wiping. The elongation is a value measured with a load cell tensile tester (Minebea Techno Graph TG-200N) based on the test method of JIS P 8132. The test piece was made into the width of 25 mm, and it was made into the average value measured five times in each direction. Here, the elongation can be adjusted according to the wrinkle rate at the time of manufacture, and in the case of the present embodiment in particular, the wrinkle rate may be set at 15 to 27%.

In addition, as specific strengths of the toilet paper according to the present embodiment, in the case of one layer, the dry tensile strength in the longitudinal direction is 245 to 330 cN/25mm, and the dry tensile strength in the transverse direction is 85 to 135 cN/25mm. Moreover, in the case of two layers, the dry tensile strength of the one layer is 130-175 cN/25mm in the longitudinal direction, and 45-75 cN/25mm in the transverse direction. In addition, the dry tensile strength concerning this embodiment means the value measured based on the tensile test of JISP8113 (1998).

On the other hand, the toilet paper according to this embodiment has an MMD (fluctuations of average friction coefficient: Fluctuations of average Frictional Coefficient) of less than 9.3. MMD is an index of smoothness, and if it is in the above range, the smoothness of the surface can be sufficiently felt when wiping, especially when wiping the skin after excretion, which is the main use of toilet paper.

FIG. 1 is a diagram showing an example of the configuration of an MMD measuring device 1 for measuring MMD. In the MMD measuring device 1, while the contact surface of the friction member 2 is brought into contact with the surface of the measurement sample 3 to which a tension T of 20 g/cm is applied in a predetermined direction with a contact pressure CP of 25 g, Move in approximately the same direction for 2 cm at a velocity V=0.1 cm/s. The coefficient of friction at this time was measured using a friction tester KES-SE (manufactured by Kato Tech Co., Ltd.). The value obtained by dividing this friction coefficient by the friction distance (movement distance D=2 cm) is MMD. The friction material 2 is formed by adjoining 20 piano wires 4 with a diameter of 0.5 mm, and has a contact surface formed so that both the length and the width are 10 mm. On the contact surface, a unit bulge formed by 20 piano wires P (curvature radius 0.25 mm) was formed at the front end.

Adjustment of the range of MMD according to the present embodiment can be easily achieved by containing the above-mentioned softening agent compound in a mass ratio to the pulp fiber according to the present embodiment in the above-mentioned grams per square meter and paper thickness. In addition, In the same manner as the dry tensile strength, etc., further adjustments can be made according to the wrinkle rate at the time of production, the type of pulp fiber, and the composition ratio.

Example

Next, examples and comparative examples of the toilet paper according to this embodiment were produced, and their physical properties such as tensile strength and MMD were measured, and further, sensory tests were performed on smoothness and cracking difficulty during use. In the evaluation in the sensory test, the standard sample (comparative example 1 in the one-ply toilet paper and comparative example 5 in the two-ply toilet paper) was set as "2", and the sample with a feeling superior to the reference sample was evaluated as "2". 3", and the sample whose feeling was inferior to the reference sample was evaluated as "1". The subjects were set to 12 people. The values in the table are mean values of the subjects. The composition and physical property values in each example are shown in Tables 1 to 4 below. In addition, Table 1 and Table 2 are examples and comparative examples related to toilet paper of one layer, and Table 3 and Table 4 are examples and comparative examples related to toilet paper of two layers.

According to the results of Tables 1 to 4, regardless of whether it is one layer or two layers, the composition of pulp fibers, the gram weight per square meter, and the paper thickness are set within the range of this embodiment, and furthermore, the content of this embodiment includes The examples (Examples 1 to 5 and Examples 6 to 9) of the fatty acid ester compound A and the fatty acid amide compound B which are softening agent compounds showed excellent results in the sensory test compared with the reference samples.

In Comparative Example 2 and Comparative Example 6 in which the content of the fatty acid amide compound B was small, the value of MMD was high, and the sensory evaluation of smoothness was also low. In addition, in Comparative Examples 3 and 7 in which the content of the fatty acid ester compound A was small, the paper strength was high, and the evaluation of tearing difficulty was high, and the evaluation of smoothness was low although the MMD was low. This is because, when the paper strength becomes high, it becomes difficult to sense smoothness sensory. In addition, the paper strength of the samples not containing the fatty acid ester compound A like Comparative Examples 4 and 8 was too high, and MMD did not appear, but the evaluation of smoothness in the sensory test was very low. Furthermore, when trying to compare Comparative Example 3 and Comparative Example 4, and Comparative Example 7 and Comparative Example 8, MMD does not decrease so much even if the contents of fatty acid amide compounds B and C are excessive.

As can be seen from the results of the above Examples and Comparative Examples, by adopting the structure according to the present embodiment, the softness, smoothness, and strength are improved, and therefore, the toilet paper has a strength that is hard to break when wiping the skin.

Above, the preferred embodiments and examples of the present invention have been described in detail, but the present invention is not limited to the above-mentioned specific embodiments and examples, and can be carried out within the scope of the gist of the present invention described in the scope of the patent claims. Various modifications and changes.

This international application claims priority based on Japanese Patent Application No. 2015-195175 filed on September 30, 2015, the entire contents of which are incorporated herein by reference.

Claims (3)

1. a kind of toilet paper, which is characterized in that the toilet paper is 1 layer of toilet paper,

It is broad leaf tree kraft pulp and softwood kraft pulp to form fiber, includes the softwood kraft of 15~55 mass % Paper pulp,

Every square metre of gram quantity is 21.0~22.5g/m²,

Thickness of paper is 110~155 μm,

Comprising relative to pulp quality be 0.024~0.075 mass % fatty acid ester based compound,

Comprising relative to pulp quality be 0.015~0.075 mass % fatty acid acyl amine compound,

Elongation is 14~25%,

MMD is less than 9.3,

The drying tensile strength of longitudinal direction is 245~330cN/25mm, and lateral drying tensile strength is 85~135cN/25mm.

2. a kind of toilet paper, which is characterized in that the toilet paper is 2 layers of toilet paper,

It is broad leaf tree kraft pulp and softwood kraft pulp to form fiber, includes the softwood kraft of 15~55 mass % Paper pulp,

Every 1 layer of every square metre of gram quantity is 15.8~17.5g/m²,

Thickness of paper is 110~155 μm

Comprising relative to pulp quality be 0.024~0.075 mass % fatty acid ester based compound,

Comprising relative to pulp quality be 0.015~0.075 mass % fatty acid acyl amine compound,

Every 1 layer of elongation is 13.0~22%,

MMD is less than 9.3,

The drying tensile strength of 1 layer of longitudinal direction is 130~175cN/25mm, and lateral drying tensile strength is 45~75cN/ 25mm。

3. a kind of manufacturing method of toilet paper, which is characterized in that using broad leaf tree kraft pulp and softwood kraft pulp as fibre Raw material is tieed up, relative to the copy paper raw material of the softwood kraft pulp comprising 15~55 mass %, is added successively relative to paper The grain size that slurry quality is 0.08~0.15 mass % is less than 0.1 μm of fatty acid ester based compound, is relative to pulp quality The grain size of 0.05~0.15 mass % is 0.5~5 μm of fatty acid acyl amine compound, will be added with the aliphatic ester system Close the copy paper raw material copy paper of object and fatty acid acyl amine compound.